Concrete-mixing machine.



C. 0. HOGLUND.

CONCRETE MIXING MACHINE. APPLICATION FILED JUNE 29, 1911.

1,019,737. Patented Mar. 5, 1912.

3 SHEETS-SHEET l.

C. 0. HOGLUND.

CONCRETE MIXING MACHINE. APPLICATION FILED JUNE 29, 1911.

1,019,737. Patented Mar. 5, 1912.

3 BHEETE-SHEET 2.

3' 65 v 0.0.Hoglumd.

COLUMBIA PLANMRAPN C0 WAsmNuToN. n. C.

UNITED STATES PATENT OFFICE.

CARL O. HOGLUND, OF CROOKSTON, MINNESOTA.

CONCRETE-MIXING MACHINE.

To all whom it may concern.

Be it known that I, CARL O. HOGLUND, a citizen of the United States,residing at Orookston, in the county of Polk and State of Minnesota,have invented certain new and useful Improvements in Concrete-MixingMachines; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in concrete mixing machines.

The invention consists in the construction and arrangement of parts aswill be hereinafter described and particularly pointed out in the claim.

In the accompanying drawings: Figure 1 is a side view of my improvedconcrete mixing machine. Fig. 2 is a top plan view thereof; Fig. 3 is acentral vertical longltudinal section; Fig. 4 is a vertical crosssection on the line tl of Fig. 2; Fig. 5 is a similar view on the line55 of Fig. 1; Fig. 6 is a detail perspective view of the delivery chuteshowing the construction and arrangement of the door for opening andclosing the discharge passage thereof.

Referring more particularly to the drawings 1 denotes the mainsupporting frame of the machine, said frame being provided with suitablesupporting wheels 2 whereby the machine may be readily moved from placeto place. Arranged on the main frame 1 is a superimposed troughsupporting frame 3 in which is disposed a mixing trough 4 whose bottominclines forward as seen in Fig. 3. Extending throughout this trough isa central longitudinally disposed agitator shaft 5 on which is secured aseries of radially projecting curved agitator arms 6, said arms beingpreferably arranged in pairs-and connected by bars 7 which at theirinner ends are secured to the sleeves ti on the said shaft 5 so as toform spiral blades whereby when the agitating shaft is revolved thecontents of the trough will be thoroughly mixed and gradually fedforward toward the discharge end of the trough. The shaft 5 is driven inthe proper direction by a suitable operating mechanism hereinafterdescribed.

Secured to one side of the main frame 1 of the machine substantiallymidway between the ends of the trough is a sand and Specification ofLetters Patent.

Application fiIed June 29, 1911.

Patented Mar. 5, 1912.

Serial No. 635,935.

gravel hopper 8, while on the opposite side of the frame is arranged acement hopper 9. It will be observed that these hoppers 8 and 9 are hungextremely low, the purpose of this construction being to facilitate thefeeding of material into them as it needs replen ishing, and to utilizeits weight in giving stability to the machine. A still further point ofadvantage in this construction is that it permits the superintendent toobserve constantly whether these hoppers need replenishing, and itpermits an inspector (if one be present) to observe whether the materialfed into them is of the proper consistency. Secured at its lower end tothe inner end of the superimposed frame 3 and supported by standards 11and 11 is a chute 10 for the sand and gravel and the cement, its frontand rear walls being closed and upright and its side walls being closedas seen in Fig. 6 and diverging at their upper ends into Wings 10 whichstand beneath the delivery ends of the elevators next to be described.On the forward standards 11 are shaft bearings 12 in which is revolublymounted an elevator operating shaft 13 on one end of which is fixedlymounted a sprocket gear 15. The gear 15 is connected by an elevatorchain 16 to a sprocket gear 17 arranged in the sand and gravel hopper 8and revolubly mounted on a suitable sup porting shaft 18 journaled inthe main frame 1 as shown. The elevating chain 16 is provided withsuitable elevating buckets 19 whereby the sand and gravel is elevatedfrom the hopper 8 and discharged into the chute 10.

On the opposite end of the shaft 13 is fixedly mounted a sprocket gear20 which is connected by an elevator chain 21 with a sprocket gear 22mounted on the opposite end of the shaft 18 from the gear 17 in thecement hopper 9. On the elevatin chain 21 is arranged a series ofelevating buckets 23 which are adapted to carry the cement upwardly fromthe cement hopper 9 and discharge the same into the chute 10 from whichthe cement together with the sand and gravel are discharged into theadjacent end of the mixing trough 4 and are thoroughly mixed together bythe agitating mechanism hereinbefore described.

Arranged on one end of the main frame 1 construction and is preferablyin the form of a gasolene engine. On the inner end of the shaft 25 ofthe engine is fixedly mounted a spur gear pinion 26 which is engagedwith a large gear 27 fixed on a suitably mounted countershaft 28. On theinner end of the shaft 28 is fixedly mounted a spur gear pinion 29 whichis engaged with a spur gear 30 fixedly mounted on the agitator operatingshaft 5 whereby the latter is driven in the proper direction foroperating the agitator.

Mounted in suitable bearings on the upper end of the standards 11 of thehopper 10 is a power transmitting shaft 31 on the inner end of which isfixedly mounted a spur gear 32. The gear 32 is in operative engagementwith the gear 27 on the countershaft 28 whereby said shaft 31 is drivenin the proper direction. On the outer end of the shaft 31 is fixedlymounted a beveled gear pinion 33 which is engaged with a similar pinion13 on the elevator operating shaft 13 whereby said shaft is driven inthe proper direction for operating the endless cement and sand andgravel elevators.

Arranged on the trough supporting frame 3 is a water tank 34 having inone side a discharge faucet 35 which connects with a perforated waterdistributing pipe 36 arranged above the central portion of the mixingtrough whereby water may be discharged in the proper quantities into thetrough and onto the material being mixed therein. The pipe 36 isprovided substantially midway bet-ween its ends with a cut as valve 36whereby the water may be cut off from the outer portion of the pipe whendesired.

The sand and gravel are placed in the sand and gravel hopper and thecement in the cement hopper in any suitable manner for being elevated orconveyed to and discharged into the chute 10 and from thence pass intothe mixing trough and after being thoroughly mixed and moistened in saidtrough are discharged therefrom to a dis charge spout 37 secured to therear end of the main frame 1 below the discharge end of the mixingtrough as shown and from which the concrete or finished material isshoveled or otherwise discharged where the same is to be laid or intoreceptacles for conveying the same to its place of disposal.

The chute 10 is provided with an inclined bottom 38 which communicatesat its lower end through a discharge opening 39 with the inner end ofthe mixing trough 4 whereby the material is discharged from the chuteinto the trough- The discharge opening in the chute 10 is provided witha door 40 slidably mounted in suitable guides 41 arranged on the frontside of the chute as shown. The door 40 is provided with a suitableoperating mechanism, said mechanism comprising rack bars 42 secured tothe outer side of the door adjacent to its opposite side edges and withwhich are engaged pinions 43 fixed on a crank shaft 44 revolubly mountedin suitable hearings on the outer side of the chute and having on oneend a crank handle 45 whereby the same may be operated to engage thepinions 43 with the racks 42 whereby the door is raised and lowered whendesired. The shaft 44 is also preferably provided with a small ratchetgear 46 with which is adapted to be engaged a locking pawl 47 pivoted tothe adjacent portion of the chute whereby the shaft is locked to holdthe door in its open or closed position. By providing the chute 10 withthe door 40 for opening and closing the discharge opening therein thematerial dumped into the chute may be continuously fed therefrom to themixing trough or the door may be closed and a certain quantity ofmaterial placed into the chute before being discharged therefrom intothe mixing trough thus permitting the machine to be employed for mixingthe material in batches or for mixing the same continuously.

From the foregoing description taken in connection with the accompanyingdrawings, the construction and operation ofthe invention will be readilyunderstood without requiring a more extended explanation.

It will be noted, as above explained, that the low-hung hoppers 8 and 9are of advantage for the reasons set forth; the mixing trough 4 isdisposed between these hoppers and is as low as possible upon the mainframe, while the water tank which is above the trough can easily .be fedthrough a hose or other connection; and the chute 10 which is disposedacross the inner end of the trough 4 has wings 10* at its upper endforming receiving tables for the material dumped by the two elevators,while its door or gate 40 may be opened from time to time to deliver thematerial in batches to the trough, or may be set as above explained sothat there will be a constant delivery into said trough. Therein thespiral blades 7 not only thoroughly mix the materials with each otherand permit a free admixture of a proper proportion of water, but bytheir shape and disposition feed the mass slowly forward until itreaches the spout 37 at the exit end of the machine. During all thistime the heavy materials are as low as possible which results in theadvantages above set forth, and the various instrumentalities aregrouped around each other in the smallest compass and mounted upon aunitary framework and single running gear in compact form.

Having thus described my invention, what I claim is: v

A concrete mixing machine comprising a supporting frame with a trougharranged within the same and having a forwardly insecured to the curvedblades, and means for 10 operating the shaft.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witclined bottom, a longitudinal shaft extending the lengthof the trough and having thereon sleeves or collars, and a series oftransverse radially projecting curved blades arranged in pairs thereon,a plurality of messes. longitudinal bars twisted in spiral form to CARLO. HOGLUND. provide blades, each pair of said longitudi- Witnesses:

Trrno. NELSON,

nal bars having one of their ends directly CONRAD A. FINsANn.

secured to said sleeves and their other ends Copies of this patent maybe obtained for five cents each, by addressing the Commissioner ofPatents, Washington, D. C.

